计算图像的信噪比，此代码是针对遥感影像开发的
Calculate the image signal to noise ratio, this code is developed for remote sensing images (2017-03-06, IDL, 2KB, 下载3次)
局部方差法的信噪比计算，通过canny算子进行窗口检测
The calculation procedure of the signal to noise ratio of remote sensing image is performed by the Canny operator. (2016-01-02, IDL, 1KB, 下载3次)